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ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration

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RPi4's co-processor will copy the board's bootloader[1] configuration
into memory for the OS to consume. Specifically, for the bootloader
configuration and upgrade user-space routines to query it through
nvmem's sysfs interface.

Introduce a reserved-memory area template for the co-processor to edit
before booting the system so as for Linux not to overwrite that memory
and to expose it as an nvmem device.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Tim Gover <tim.gover@raspberrypi.com>
Link: https://lore.kernel.org/r/e8ca9365-a1f2-1f9d-377c-13bf97883cce@linaro.org

[1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
This commit is contained in:
Nicolas Saenz Julienne 2021-01-12 15:23:40 +01:00
parent fcb985a064
commit 6b4233f70a
1 changed files with 17 additions and 0 deletions
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17
arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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@ -25,6 +25,7 @@ aliases {
emmc2bus = &emmc2bus;
ethernet0 = &genet;
pcie0 = &pcie0;
blconfig = &blconfig;
};
leds {
@ -218,6 +219,22 @@ &pwm1 {
status = "okay";
};
&rmem {
/*
* RPi4's co-processor will copy the board's bootloader configuration
* into memory for the OS to consume. It'll also update this node with
* its placement information.
*/
blconfig: nvram@0 {
compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
#address-cells = <1>;
#size-cells = <1>;
reg = <0x0 0x0 0x0>;
no-map;
status = "disabled";
};
};
/* SDHCI is used to control the SDIO for wireless */
&sdhci {
#address-cells = <1>;